<!-- 列配置弹窗   组件(隐藏/刷新/隐藏列) -->
<template>
  <div class="top-right-btn" :style="style">
    <el-row>
      <el-button @click="toggleSearch()" v-if="search">
        {{ showSearch ? "隐藏搜索" : "显示搜索" }}
      </el-button>
      <el-button @click="refresh()" style="margin-left: 10px"> 刷新 </el-button>
      <el-button
        @click="showColumn()"
        v-if="Object.keys(columns).length > 0 && showColumnsType == 'transfer'"
        style="margin-left: 10px"
      >
        显隐列
      </el-button>
      <el-dropdown
        trigger="click"
        :hide-on-click="false"
        style="padding-left: 12px"
        v-if="Object.keys(columns).length > 0 && showColumnsType == 'checkbox'"
      >
        <el-button> 隐藏列 </el-button>
        <el-dropdown-menu slot="dropdown">
          <!-- 全选/反选 按钮 -->
          <el-dropdown-item>
            <el-checkbox
              :indeterminate="isIndeterminate"
              v-model="isChecked"
              @change="toggleCheckAll"
            >
              列展示
            </el-checkbox>
          </el-dropdown-item>
          <div class="check-line"></div>
          <template v-for="(item, key) in columns">
            <el-dropdown-item :key="key">
              <el-checkbox
                v-model="item.visible"
                @change="checkboxChange($event, key)"
                :label="item.label"
              />
            </el-dropdown-item>
          </template>
        </el-dropdown-menu>
      </el-dropdown>
    </el-row>
    <el-dialog :title="title" :visible.sync="open" append-to-body>
      <el-transfer
        :titles="['显示', '隐藏']"
        v-model="value"
        :data="transferData"
        @change="dataChange"
      ></el-transfer>
    </el-dialog>
  </div>
</template>

<script>
export default {
  name: "ColumnConfigDialog",
  data() {
    return {
      value: [],
      title: "显示/隐藏",
      open: false,
    };
  },
  props: {
    /* 是否显示检索条件 */
    showSearch: {
      type: Boolean,
      default: true,
    },
    /* 显隐列信息（数组格式、对象格式） */
    columns: {
      type: [Array, Object],
      default: () => ({}),
    },
    /* 是否显示检索图标 */
    search: {
      type: Boolean,
      default: true,
    },
    /* 显隐列类型（transfer穿梭框、checkbox复选框） */
    showColumnsType: {
      type: String,
      default: "checkbox",
    },
    /* 右外边距 */
    gutter: {
      type: Number,
      default: 10,
    },
  },
  computed: {
    style() {
      const ret = {};
      if (this.gutter) {
        ret.marginRight = `${this.gutter / 2}px`;
      }
      return ret;
    },
    isChecked: {
      get() {
        return Array.isArray(this.columns)
          ? this.columns.every((col) => col.visible)
          : Object.values(this.columns).every((col) => col.visible);
      },
      set() {},
    },
    isIndeterminate() {
      return Array.isArray(this.columns)
        ? this.columns.some((col) => col.visible) && !this.isChecked
        : Object.values(this.columns).some((col) => col.visible) &&
            !this.isChecked;
    },
    transferData() {
      if (Array.isArray(this.columns)) {
        return this.columns.map((item, index) => ({
          key: index,
          label: item.label,
        }));
      } else {
        return Object.keys(this.columns).map((key, index) => ({
          key: index,
          label: this.columns[key].label,
        }));
      }
    },
  },
  created() {
    if (this.showColumnsType == "transfer") {
      // transfer穿梭显隐列初始默认隐藏列
      if (Array.isArray(this.columns)) {
        for (let item in this.columns) {
          if (this.columns[item].visible === false) {
            this.value.push(parseInt(item));
          }
        }
      } else {
        Object.keys(this.columns).forEach((key, index) => {
          if (this.columns[key].visible === false) {
            this.value.push(index);
          }
        });
      }
    }
  },
  methods: {
    // 搜索
    toggleSearch() {
      this.$emit("update:showSearch", !this.showSearch);
    },
    // 刷新
    refresh() {
      this.$emit("queryTable");
    },
    // 右侧列表元素变化
    dataChange(data) {
      if (Array.isArray(this.columns)) {
        for (let item in this.columns) {
          const key = this.columns[item].key;
          this.columns[item].visible = !data.includes(key);
        }
      } else {
        Object.keys(this.columns).forEach((key, index) => {
          this.columns[key].visible = !data.includes(index);
        });
      }
    },
    // 打开显隐列dialog
    showColumn() {
      this.open = true;
    },
    // 单勾选
    checkboxChange(event, key) {
      if (Array.isArray(this.columns)) {
        this.columns.filter((item) => item.key == key)[0].visible = event;
      } else {
        this.columns[key].visible = event;
      }
    },
    // 切换全选/反选
    toggleCheckAll() {
      const newValue = !this.isChecked;
      if (Array.isArray(this.columns)) {
        this.columns.forEach((col) => (col.visible = newValue));
      } else {
        Object.values(this.columns).forEach((col) => (col.visible = newValue));
      }
    },
  },
};
</script>

<style scoped>
.top-right-btn {
  margin-bottom: 10px;
}
</style>